@article{10_21136_CMJ_1989_102276,
     author = {Ohriska, J\'an},
     title = {Oscillation of differential equations and $v$-derivatives},
     journal = {Czechoslovak Mathematical Journal},
     pages = {24--44},
     publisher = {mathdoc},
     volume = {39},
     number = {1},
     year = {1989},
     doi = {10.21136/CMJ.1989.102276},
     mrnumber = {983481},
     zbl = {0673.34044},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1989.102276/}
}